EM Acoustics AD-2 2-channel professional power amplifier
- Sophisticated side-chain limiters
- Full DC and short circuit protection
- Bridge/mono operation
- High power to size ratio
The AD-2 is a high quality two-channel power amplifier designed to power EM Acoustics passive loudspeakers in a variety of fixed installation applications.
Designed by MC2 Audio, the AD-2 utilises complementary Class-AB bipolar output stages, combined with a unique current driven floating drive stage and conventional analogue level controls. Impeccable sound quality is maintained at all times over a very wide range of load and temperature conditions.
The front panel for the AD-2 carries the AC mains power switch and indicator LED, as well as a simple and intuitive set of indicators. Signal and limit LEDs on each channel show audio signal presence and the onset of limiting, and indicators for bridged mode and audio protection are provided. Each channel also has a multi-detent analogue level control allowing precise signal level settings when in use.
Amplifier protection is also an area where the AD-2 delivers completely. A soft-start sequence with complete inrush protection means the AD-2 powers up completely muted, and then gradually fades the input up to the previous level. A comprehensive diagnostic circuit constantly monitors load, temperature and other parameters and automatically adjusts the power supply if overheating or any other problems occur. Sophisticated “side chain” limiters prevent distortion and speaker damage, but are out of circuit until the onset of clipping. Output short circuit and DC output are also protected – and the AD-2 will only require a manual restart if output short circuits occur.
The AD-2 is built around a 2U all-metal chassis, which provides a roadworthy package. Handles are included within the front 5mm thick fascia panel. A rackmount kit is also supplied to enable the amplifier to be secured at the rear for additional stability. Low-noise variable speed fans are fitted to the AD-2 (cooling is from front to rear), along with a reticulated foam dust filter which can easily be removed for cleaning.
The rear panel houses the Neutrik XLR input connectors, along with output connectors on Neutrik SpeakONTM NL4. A combined IEC mains power receptacle and fuseholder is also presented on the rear panel, along with the recessed switch for bridged mode.
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